Hex gold pans (large variability of sizes). It's form in real metric system unit setup, ready for 3d print and use for prospecting gold panning. There are many size of pans, and 2 variants of depth - 3 and 2 inches(7.62 cm and 5.13 cm), and there are extended modification on bottom construction(forced). Also there are models with small riffles only(additionally).
Note: material editor has slot with bumped mtl(last sdcreenshot), use it if you want